CVE-2021-3543: Fedoraproject Fedora

Medium severity, CVSS 6.7. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.

Affected products

• Fedoraproject Fedora: version 34 only
• Nitro Enclaves Project Nitro Enclaves: before 5.10.0 (fixed in 5.10.0)
• Red Hat Enterprise Linux: version 8.0 only

Published 2021-06-01. Last modified 2026-06-17.